Most of its members are employees of The Associated Press, where the union represents reporters, editors, photographers, broadcast staff, payroll clerks and computer technicians. It also represents employees of United Press International and the EFE news agency in the United States.
The national local was founded in 1958, but its roots extend back to the 1940s. The subject of organizing workers at AP was the subject of a case before the U.S. Supreme Court (Associated Press v N.L.R.B, 301 U.S. 103), which held that the First Amendment did not give media employers immunity from labor laws. That case involved an editorial worker who edited and rewrote news copy.